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If the reloading info between a reloading manual (book) differs from the info given on a website by the same manufacturer, which do I follow?
Discrepancies between book and website
- Thread starter photog_shooter
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hometownhero
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Easier to update the web page then a book that is already in print
As suggested (in this thread, and every manual/online source I've ever read), start at the start and work up. I have found discrepancies between various sources for one of my favs (H380 in 6.5x55). Turns out that H380 varied quite a bit by lot over the decades it's been available. Couple that with no 2 test platforms being truly identical, and things will vary. I'd been collecting manuals for decades, so going with data made available closest to the powder's manufacture date helped narrow down starting load choices.
I started loading for frugality's sake, but the ability to fine tune a load for an individual rifle has been a fun pursuit all of it's own.
Yes, some powders have been known to have significant lot to lot variations in canister offerings. 4320 come to mind.
But the big difference is in chambers and barrels. I have 3 each of some calibers because 3 of us in the family shoot the same kind of matches. These rifles are made at the same time, with successive barrel blanks and chambers cut with the same reamer. They typically show a 1 to 2 gr variation in max powder charge and a 150fps variation in velocity.
When you consider factory barrels and chambers, the difference is huge. Groove diameter can run from .3065 to .3085. And throat depth can vary from bullet almost touching rifling to 75 thou of free-bore (Remington).
If one lab used a Tika and another used Remington, the load data would be so different that you would wonder if they were the same caliber.
The Max load for a Remington rifle might almost be a pipe bomb in a chamber cut to the legal minimum size.
The only way for the load data specs to be the same is if the various powder and bullet companies all shared the same rifle back and forth. They don't. And if they did, it would not help you, unless it was your rifle they shared. Your rifle is different. Start laow and work up.
But the big difference is in chambers and barrels. I have 3 each of some calibers because 3 of us in the family shoot the same kind of matches. These rifles are made at the same time, with successive barrel blanks and chambers cut with the same reamer. They typically show a 1 to 2 gr variation in max powder charge and a 150fps variation in velocity.
When you consider factory barrels and chambers, the difference is huge. Groove diameter can run from .3065 to .3085. And throat depth can vary from bullet almost touching rifling to 75 thou of free-bore (Remington).
If one lab used a Tika and another used Remington, the load data would be so different that you would wonder if they were the same caliber.
The Max load for a Remington rifle might almost be a pipe bomb in a chamber cut to the legal minimum size.
The only way for the load data specs to be the same is if the various powder and bullet companies all shared the same rifle back and forth. They don't. And if they did, it would not help you, unless it was your rifle they shared. Your rifle is different. Start laow and work up.
I do that when I get down the last pound of an 8 pounder. I dump that pound in the next 8 pounder and shake.
I did it once with a whole bunch of odds and ends of 4895. Had so much I had to mix it in a garbage can. Still working on that blend.
